We report results from three distinct but related thrusts that aim to elucidate the atomic-scale structure and properties of the SiC-SiO2 interface. a) First-principles theoretical calculations probe the global bonding arrangements and the local processes during oxidation; b) Z-contrast atomic-resolution transmission electron microscopy and electron-energy-loss spectroscopy provide images and interface spectra, and c) nuclear techniques and electrical measurements are used to profile N at the interface and determine interface trap densities.